The heart sounds, "lub" and "dup," occur when the atria contract and subsequently when the ventricles contract.

Name: The heart sounds, "lub" and "dup," occur when the atria contract and subsequently when the ventricles contract.
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The heart sounds "lub" and "dup" actually occur due to the closure of the heart valves (mitral and tricuspid valves during systole, and aortic and pulmonary valves during diastole), not specifically when the atria or ventricles contract.

The Heart Sounds, "Lub" and "Dup," Occur When the Atria